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Can a 64bit Guest OS run on a 32bit Host OS if the processor is 64bit? i'm running virtualbox on ubuntu 10.04 32bit

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Yes, as long as these conditions are met:

  1. Your processor is 64-bit with hardware virtualization support.

  2. Hardware virtualization is enabled for the VM.

  3. Obviously, the virtual machine is configured to be 64-bit.

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